Needle Valve and Variable Restrictor Valve

needle valve cross section

Needle valve cross section

Needle valve has the same working principle with globe valve; the most obvious different is needle valve uses long tapered point at valve stem end instead of disk on globe valve.

Needle valve is suitable to use as a throttle valve since it has smaller seating surface area. Needle valve can be used to protect gauges by providing flow control to the gauge to prevent sudden surge pressure.

A variable restrictor valve is a modified needle valve. This valve doesn’t have any hand wheel but it be adjusted to provide specific rate of low which provide desired time of operation.

variable restrictor valve

Variable restrictor valve

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